Blue sulfur dye and process of making same.



NIT STATES PATENT OFFICE;

LOUIS HAAS, or PARIS, FRANCE, ASSIGNOR TO CASSELLA COLOR COMPANY, OF

' NEW YORK, N. Y.

BLUE SULFUR DYE AND'PROOESS OF MAKING SAME.

I atented April 27, 909.

Application flled January 18, 1909. Serial No. 472,911. a

T0 (111 whom it may cmtcem:

Be it known that I, Louis HAAS, chemist,

a citizen of. the Republic of France, and

in the presence of concentrated sulfuricacid new products are obtained which on being heated with polysulfids may be transformed into valuable sulfid colors.

The process is illustrated by the following example:

Example: 1 kilo carbazol is dissolved in kilossulfuric acid of 66 B., into of. nitrosophenol in about 8 kilos sulfuric acid, while stirring well and taking care that the temperature does not rise above 30 .C. The dark blue solution is diluted with ice; the recipitate which has formed, is filtered o and washed and pressed. The thus, obtained product represents a "bronze like mass. In order to transform the same into the sulfur" color, it is stirred up carefully with a little water and heated in an open vessel with 1 to 1.5 kilos crystallized sodiumrsiilfid, until decoloration is complete. 1 to 1.5 kilos sulfur are then introduced while stirring and the mixture is concentrated by evaporation and kept melted. In

this manner a sulfid color is obtained which in an alkaline sulfid bath dyes cotton dark- 6- o r and prec air or wit blue shades. The pure coloring matter may beobtained by one for instance dissolving with alkaline sulfids of the known methods,

itating by means of a current of acids, em. The dyes'tuflf so obtained, possesses excellent dyeing properties and is distinguished especlally by its intensity, its beautiful shade, and fastness to light and chlorin. Q

If in the above process the nitrosophenol is substituted by analogous bodies, blue dyestulfs, possessing analogous properties, are obtained. I

Having now particularly described and ascertained the nature of my said invention and in what manner the same is to be pera formed I declare that what I claim is 1. The production matters by condensing a nitrosophenol with carbazol and heating the products with polysulfids, substantially as described. i

2. The new dyestuff which may be obcondensing a nitrosophenolj with carbazol and heating the product with polysulfids, and which is a dark blue powder soluble in concentrated sulfuric acid with a greenish black color, soluble in water in the tained by presence of alkaline sulfids or reducing agents, and dyeing from such solutions fast blue shades on cotton substantially as described. Y

The foregoing specification of my new products obtained by the reaction of'mtrosophenol or analogous 'the presence, of concentrated sulfuric acid of fast blue coloring bodies on carbazol in signed by me this 19th day of December 1908.

LOUIS HAAS.

Witnesses: I

DEAN B; Mason,

MAURICE H. PIGUET, 

